by Saleem Shahid in Dawn, March 10th, 2023QUETTA: One person was killed and three others were injured in an explosion in the Hazara dam area of Harnai district on Thursday. Officials said unknown miscreants planted an improvised explosive device (IED) at the under-construction dam which exploded when a tractor was passing through the area. The tractor was carrying drinking water for the employees working at the dam site. As a result of the powerful explosion,…